Co2 pressure gauge Help

[koolkuna]

Just purchased KegKing low pressure gauge to replace the original one that came with the spunding valve. Installed the new gauge with plenty of plumbers tape then I pressurised a corny keg to 15 psi connected the spunding valve to test the gauge. It seems that the gauge is off the mark by 5 psi. according to my regulator reeding No leaks present. Any suggestions

 

[Danscraftbeer]

You can get slight losses in lines to receiving vessels. Meaning the bottle may be putting out 15psi but your receiving keg may not have fully pressurized to 15 psi. I notice this when doing co2 transfers from bottle to kegmenter to receiving keg. Bottle may be set to 20 psi and the final receiving keg wont get to 20 psi, and/or its variances in the accuracy of one or both guages..

 

[koolkuna]

I guess their is no easy way of adjusting the gauge. ?? I have a second spunding valve that I purchased from GG years ago to check the variances. Both spunding valves readings are the same 5 psi less. Should I mentally adjust the reading as 10psi = 15psi or ?? I use the spunding valves on a kegmenter I guess 5 psi won't matter rather way to the yeast during fermentation. I usually fermented at 15psi after 2/7 days with a blow off.

 

[MHB]

Sorry Dans, you are confusing static pressure and dynamic, you will only get a difference in pressure when there are flow losses (friction...) when there is no flow the whole system will equalise. exception being where a pressure control device (regulator) or check valve is installed in line, both will often give a permanent drop across them, spring loaded check valves require a given amount of pressure to force them open, they will close when the difference is the same as the actuating pressure. So just be careful what is between the two gauges.

Bottle pressure gauges are notoriously inaccurate (especially after a couple of years of use) and its really hard to tell whether a gauge is reading over/under or spot on. There are gauge calibration services available, at a price. You may be able to construct a big enough manometer to get a fair idea at home. Be a lot easier in metric than in psi, where the pressure in kPa=the head of water in meters*g (g=acceleration due to gravity)enough pressure to lift water 6m up a pipe/garden hose (vertically) for instance would =6*9.81 =58.86kPa (call it 60kPa)

If you really want to know, it will cost you, or take some work
Mark

 

[koolkuna]

Yeah thanks guys. Way too technical for me I think I'll just use the gauge as a gauge HA HA.